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I looked things over more closely today. The barrel is threaded 1/2x28 RH just like an AR15 barrel. The dimensions of everything to the shoulder is virtually spot on. An AR15 flash hider installs perfectly. When I thread the suppressor down as far as it will go, there is no play at all. It's stopping at the muzzle just like it does on all of my pistols. So long as the crown is square to the bore, I should be good to go. The internal diameter of the suppressor's bullet channel is 0.400". Given that the diameter of a 9mm bullet is 0.355", the muzzle would have to be off significantly from square in order for there to be a problem. Now that I think about it, I'm not sure that having the suppressor go all the way to the shoulder would be better. In theory, the shoulder might not be square to the barrel. Fact is though, both the shoulder and muzzle look to be square to the bore. I'll let y'all know what happens.

BTW, I'm not sure that the spacer would work. The part right before the shoulder is not threaded, just like an AR15 barrel. If the inside diameter is threaded throughout, it wouldn't be able to screw all the way to the shoulder.

I looked things over more closely today. The barrel is threaded 1/2x28 RH just like an AR15 barrel. The dimensions of everything to the shoulder is virtually spot on. An AR15 flash hider installs perfectly. When I thread the suppressor down as far as it will go, there is no play at all. It's stopping at the muzzle just like it does on all of my pistols. So long as the crown is square to the bore, I should be good to go. The internal diameter of the suppressor's bullet channel is 0.400". Given that the diameter of a 9mm bullet is 0.355", the muzzle would have to be off significantly from square in order for there to be a problem. Now that I think about it, I'm not sure that having the suppressor go all the way to the shoulder would be better. In theory, the shoulder might not be square to the barrel. Fact is though, both the shoulder and muzzle look to be square to the bore. I'll let y'all know what happens.

BTW, I'm not sure that the spacer would work. The part right before the shoulder is not threaded, just like an AR15 barrel. If the inside diameter is threaded throughout, it wouldn't be able to screw all the way to the shoulder.

The spacer isn't threaded and its inner diameter is large enough to allow it past the non threaded portion and flat against the shoulder. I've got a spacer for use on a 22LR AR15 look-alike. Same issue that you have with AR-15 length threads, but a can only meant for pistol length threads.